Datasheet

9
Typical Performance Curves
FIGURE 5. HC/HCT221 OUTPUT PULSE WIDTH vs
TEMPERATURE
FIGURE 6. HC/HCT221 K FACTOR vs SUPPLY VOLTAGE
FIGURE 7. HC221 OUTPUT PULSE WIDTH vs C
X
FIGURE 8. HC/HCT221 OUTPUT PULSE WIDTH vs C
X
685
680
675
670
665
t
W
, PULSE WIDTH (µs)
-75 -50 -25 0 25 50 75 100 125 150 175
T
A
, AMBIENT TEMPERATURE (
o
C)
C
X
= 1µF
R
X
= 10K
V
CC
= 5V
0.9
0.8
0.7
0.6
024681
0
V
CC
, SUPPLY VOLTAGE (V)
K FACTOR
R
X
= 10K
T
A
= 25
o
C
HCT
10
6
10
5
10
4
10
3
10
2
10
1
0.1
10
10
2
10
3
10
4
10
5
10
6
10
7
10
8
t
W
, PULSE WIDTH (µs)
C
X
, TIMING CAPACITANCE (pF)
R
X
= 100K
R
X
= 50K
R
X
= 10K
R
X
= 2K
V
CC
= 2V
10
6
10
5
10
4
10
3
10
2
10
1
0.1
10
10
2
10
3
10
4
10
5
10
6
10
7
10
8
t
W
, PULSE WIDTH (µs)
C
X
, TIMING CAPACITANCE (pF)
V
CC
= 4.5V
R
X
= 100K
R
X
= 50K
R
X
= 10K
R
X
= 2K
CD54HC221, CD74HC221, CD74HCT221